1and1 are useless with handling spam, i had to abandon an email address i used for my online shop because the amount of spam that got in, and their spam filters considered paypal as a spammer, not good when i take payment by paypal, so i had to give up and change email addresses. i emailed them asking if they could block any ip addresses that come from china as thats where 99.8% of my spam came from they emailed and said just put the emails on the black list, what is the point of that when the email addresses are spoofed, all i would get is a very long and pointless black list, same with trying to white list paypal payments as the email address is of the customer not paypal itself.
i tried to even get in touch with ISP's of the websites and email addresses the spam comes from, but as they dont come from english speaking countries, im pretty much screwed. or they seem not to care at all with no action. im not a big fan on spam blockers as they can be more harmful then beneficial